fix deadlock under concurrent truncate and releases

[davies]

close #3454

[codecov-commenter]

Codecov Report

Patch coverage: 50.00% and project coverage change: -0.08 ⚠️

Comparison is base (c80456c) 56.28% compared to head (842b4e3) 56.20%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3457      +/-   ##
==========================================
- Coverage   56.28%   56.20%   -0.08%     
==========================================
  Files         148      149       +1     
  Lines       36208    36214       +6     
==========================================
- Hits        20379    20355      -24     
- Misses      13614    13649      +35     
+ Partials     2215     2210       -5     

Impacted Files	Coverage Δ
pkg/vfs/vfs.go	76.24% <0.00%> (-0.10%)	⬇️
pkg/vfs/handle.go	82.85% <57.14%> (-1.48%)	⬇️

... and 7 files with indirect coverage changes

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